This achievement is the trickiest one in the game as its somewhat tedious and really annoying if failed.
Easiest way to get this is by starting a game with four people. (I did this on my phone by using a public and private tab on Safari, and a public and private tab on the Chrome app.) Try to name the players something easy to remember, like One Two Three Four.
Start the game and a small cutscene will start. Wait for your device to say either "You are a HUMAN" or "You are an ALIEN". Scroll through every tab and confirm the identity, and remember which tab is the alien.
Next, wait 11 minutes. With four people, the timer is at its lowest being 12 minutes. The goal is to wait until the timer reads four seconds. The Button takes approximately three seconds to push. Once the clock reads four seconds, Push The Button as a HUMAN, and vote to remove the alien. Confirm the vote on the other tabs, and then you'll get the achievement.